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WPA is crackable if you have a weak password/encryption key. The attack is done with wordlists I think. Correct me if I'm wrong.
Try to give the search function a chance, I think Xploits have done a video tutorial on WPA cracking.

The only time you can crack the pre-shared key is if it is a dictionary word or relatively short in length. Conversely, if you want to have an unbreakable wireless network at home, use WPA/WPA2 and a 63 character password composed of random characters including special symbols.